DE60225513T2 - Tone antenna - Google Patents

Tone antenna

Info

Publication number
DE60225513T2
DE60225513T2 DE60225513T DE60225513T DE60225513T2 DE 60225513 T2 DE60225513 T2 DE 60225513T2 DE 60225513 T DE60225513 T DE 60225513T DE 60225513 T DE60225513 T DE 60225513T DE 60225513 T2 DE60225513 T2 DE 60225513T2
Authority
DE
Germany
Prior art keywords
antenna
frequency
frequency band
multi
element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
DE60225513T
Other languages
German (de)
Other versions
DE60225513D1 (en
Inventor
Hiroshi Warabi-shi SHIMIZU
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Antenna Co Ltd
Original Assignee
Nippon Antenna Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP2001050642 priority Critical
Priority to JP2001050642 priority
Application filed by Nippon Antenna Co Ltd filed Critical Nippon Antenna Co Ltd
Priority to PCT/JP2002/000407 priority patent/WO2002069444A1/en
Publication of DE60225513D1 publication Critical patent/DE60225513D1/en
Application granted granted Critical
Publication of DE60225513T2 publication Critical patent/DE60225513T2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q23/00Antennas with active circuits or circuit elements integrated within them or attached to them
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00Details of, or arrangements associated with, antennas
    • H01Q1/12Supports; Mounting means
    • H01Q1/22Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00Details of, or arrangements associated with, antennas
    • H01Q1/27Adaptation for use in or on movable bodies
    • H01Q1/32Adaptation for use in or on road or rail vehicles
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00Details of, or arrangements associated with, antennas
    • H01Q1/27Adaptation for use in or on movable bodies
    • H01Q1/32Adaptation for use in or on road or rail vehicles
    • H01Q1/325Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle
    • H01Q1/3275Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle mounted on a horizontal surface of the vehicle, e.g. on roof, hood, trunk
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00Details of, or arrangements associated with, antennas
    • H01Q1/36Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30Arrangements for providing operation on different wavebands
    • H01Q5/307Individual or coupled radiating elements, each element being fed in an unspecified way
    • H01Q5/314Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
    • H01Q5/321Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors within a radiating element or between connected radiating elements
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/30Arrangements for providing operation on different wavebands
    • H01Q5/378Combination of fed elements with parasitic elements
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/40Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements
    • H01Q5/48Combinations of two or more dipole type antennas
    • H01Q5/49Combinations of two or more dipole type antennas with parasitic elements used for purposes other than for dual-band or multi-band, e.g. imbricated Yagi antennas
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/50Feeding or matching arrangements for broad-band or multi-band operation
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04Resonant antennas
    • H01Q9/30Resonant antennas with feed to end of elongated active element, e.g. unipole

Description

  • TECHNICAL FIELD
  • The The present invention relates to a multi-frequency antenna, which is suitable for use in two different mobile radio bands and FM / AM radio bands work.
  • BACKGROUND
  • It Different types of antennas are known in vehicles are installed, however, conventional roof antennas are on installed on the vehicle roof have been preferred since they allow the reception sensitivity is improved by the fact that the Antenna is installed on the roof, which is the highest position on the vehicle is. Furthermore, it is suitable to use an antenna that is suitable for a Reception of both FM and AM radio bands is suitable because general an FM / AM radio is mounted in a vehicle, and consequently are roof antennas for a reception of two radio bands together, have been widespread.
  • If a mobile phone is installed in a vehicle, then a Antenna for the mobile phone attached to the vehicle. In this case, then, if the number of usable frequencies for mobile phones is insufficient due to an increase has become in the number of participants, cases exist where two frequency bands for the Use of a mobile phone are assigned, namely a frequency band, the can be used in all regions, and a frequency band that in urban Areas can be used. For example, in Europe, mobile phones, the 900 MHz band of the Global System for Mobile Communication (GSM) to compensate for the lack of usable frequencies, mobile phones, which also use the 1.8 GHz Digital Cellular System (DCS) become. If corresponding antennas respectively and independently in mounted on a vehicle, then arise design problems, and Maintenance and installation tasks, and the like, are becoming more complex, and Consequently, multi-frequency antennas are the two frequency bands for mobile phones received, and FM / AM radio bands, been proposed in a single antenna.
  • A multi-frequency antenna used in the Japanese Patent Laid-Open No. 06-132714 is known as an example of this type of multi-frequency antenna. This multi-frequency antenna is constituted by a retractable rod antenna constituting a combined three-wave antenna for receiving a mobile phone band, an FM radio band and an AM radio band, a planar radiating element comprising a GPS antenna for receiving GPS signals. Forming signals, and a Schleifenabstrahlelement forming a keyless entry antenna to receive keyless access signals formed.
  • These Antennas are on the top surface of a main body installed and a metal plate is in the upper area of the main body provided, wherein the planar, radiating body and the loop-shaped, radiating body on this plate over an inductive layer are formed. Because the plate is a ground plane The planar, radiating element and the loop-shaped, radiating work Element as microstrip antennas. Furthermore, a protective cover over the planar, radiating element and the loop-shaped, radiating element formed.
  • There a multi-frequency antenna of this type a retractable rod antenna it is necessary to create a space around the rod antenna when installed. That's why, while it can possible is the multi-frequency antenna on the boot lid or the Mudguards of the Vehicle where such a space can be formed, These are not installed on the roof, giving the optimal position for arranging an antenna, since this is not the required Has recording room.
  • Therefore, a multi-frequency antenna designed to solve this problem is known in the art Japanese Patent Laid-Open No. 10-93327 disclosed.
  • These Multi-frequency antenna is designed by an antenna element is to resonate at multiple frequencies by provided with a trap coil, and by a cover section, the built-in matching circuit board, or the like, has, on which this antenna element is installed, formed. The Multi-frequency antenna can, by attaching this cover section on the roof, to be installed on the roof.
  • With the increase in the number of users of mobile phones, a plurality of frequency bands have been allocated to the use of the mobile phones. For example, in the PDC (Personal Digital Cellular Telecommunication System) used in Japan, the 800 MHz band (810 MHz-956 MHz) and the 1.4 GHz band (1429 MHz-1501 MHz) have been assigned. In Europe, 800 MHz (870 MHz-960 MHz) GSM (Global System for Mobile Communications) and 1.7 GHz (1710 MHz-1880 MHz) DCS (Digital Cellular System) have been used. In order to operate an antenna in a variety of operating frequencies of this kind, antennas operating in the respective frequency bands are ge However, two antennas are generally connected by means of a choke coil so that they do not affect each other's operation of the other.
  • Indeed is it in a choke, such as a trap coil, or the like, difficult to receive signals over a wide frequency range to separate. In other words is it just when a choke coil between antennas, the in respective frequency bands work, is provided when the frequency bandwidths are large, such as in cellphone bands, not possible, to design the respective antennas so that they are independent of them frequency bands work, and as a result there is a problem that the antennas influence each other and not designed this way can be that they work satisfactorily.
  • Farther There is also a problem in that the antenna is in the size due to Installation of a choke coil increased.
  • The US 5,327,151 discloses a non-grounded broadband type ultra-short wavelength antenna comprising a rod antenna element and a metal element parallel resonance part formed by the electrostatic capacitance between first and second metal elements installed in parallel with each other, thus a double-balanced circuit to form. The antenna is thus suitable for a wider frequency band and has a required gain for the entire frequency band used. The parallel bars are both connected to a feed line.
  • DISCLOSURE OF THE INVENTION
  • Therefore It is an object of the present invention to provide a compact Multi-frequency antenna to create over at least two wide frequency bands is working.
  • In order to achieve the above object, the multi-frequency antenna according to the present invention is a multi-frequency antenna comprising:
    an antenna circuit board on which an antenna structure and a passive element structure are formed near the antenna structure; an antenna housing section for receiving the antenna circuit board; and an antenna element in which a choke coil is disposed between an upper element and a lower element, the lower end of the lower element being connected to the upper end of the antenna structure formed on the antenna circuit board when the antenna element is attached to the antenna element Antenna housing section is installed; wherein the antenna structure and the structure of the passive element lie in one plane on the antenna circuit board, and wherein the antenna device comprising the antenna structure and the structure of the passive element is arranged to be in a first frequency band and a second frequency band Frequency band operates, which has approximately twice the frequency of the first frequency band.
  • Farther can, in the multi-frequency antenna according to the present invention Invention described above, the first frequency band and the second frequency band be mobile bands.
  • Farther can, in the multi-frequency antenna according to the present invention, which is described above, the entirety of the antenna, including the upper antenna element and the choke coil, be set up so that it can work in a third frequency band, the lower one is considered the first frequency band.
  • Farther can in the multi-frequency antenna according to the present invention Invention described above, frequency separating means for Separating the first frequency band and the second frequency band from the third frequency band be integrated into a printed circuit board, the inside the antenna housing section is included.
  • Farther can in the multi-frequency antenna according to the present invention, which is described above, the frequency separator Adjustment circuit for the first frequency band and the second frequency band.
  • According to the present Invention is an antenna device comprising a lower element, and an antenna structure and a passive element structure, which are formed on an antenna circuit board, in capable of, in a first frequency band and a second frequency band, the nearly of the double frequency of the first frequency band is to work, without using a choke coil, and hence the multi-frequency antenna be made compact.
  • Furthermore, FM / AM broadcasts can be received by the entire antenna, including an upper antenna connected to the lower element via a choke coil. The multi-frequency signal received by the multi-frequency antenna is divided by frequency dividers into a mobile radio signal and an FM / AM signal. In this case, a matching circuit may be included in the section for separating the mobile radio bands, and since the frequency separating device is accommodated inside the antenna housing section, a more compact design of the multi-frequency antenna can be achieved.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • 1 Fig. 10 is a diagram showing the entire structure of a multi-frequency antenna according to an embodiment of the present invention;
  • 2 FIG. 12 is a diagram illustrating an enlarged view of a portion of a multi-frequency antenna according to an embodiment of the present invention; FIG.
  • 3 Fig. 10 is a plan view showing the structure of a multi-frequency antenna according to an embodiment of the present invention, wherein the antenna element and the cover portion have been removed;
  • 4 Fig. 10 is a plan view showing the structure of a multi-frequency antenna according to an embodiment of the present invention, wherein the antenna element and the cover portion have been removed;
  • 5 Fig. 12 shows a circuit illustrating an equivalent circuit of a multi-frequency antenna according to an embodiment of the present invention;
  • 6 Fig. 12 is a circuit diagram of a frequency separating circuit used in an antenna circuit board in a multi-frequency antenna according to an embodiment of the present invention;
  • 7 Fig. 10 is a diagram showing the structure of the front surface of an antenna circuit board in a multi-frequency antenna according to an embodiment of the present invention;
  • 8th Fig. 10 is a diagram showing the structure of the rear surface of an antenna circuit board in a multi-frequency antenna according to an embodiment of the present invention;
  • 9 Fig. 12 is a Smith chart showing impedance characteristics in a GSM frequency band of a multi-frequency antenna according to an embodiment of the present invention;
  • 10 Fig. 12 is a diagram illustrating VSWR characteristics in a GSM frequency band of a multi-frequency antenna according to an embodiment of the present invention;
  • 11 Fig. 10 is a Smith chart showing impedance characteristics in a DCS frequency band of a multi-frequency antenna according to an embodiment of the present invention;
  • 12 FIG. 12 is a diagram illustrating VSWR characteristics in a DCS frequency band of a multi-frequency antenna according to an embodiment of the present invention; FIG.
  • 13 Fig. 10 is a Smith chart showing impedance characteristics in a GSM frequency band of a multi-frequency antenna according to an embodiment of the present invention in a case where the matching circuit is removed;
  • 14 Fig. 12 is a diagram illustrating VSWR characteristics in a GSM frequency band of a multi-frequency antenna according to an embodiment of the present invention in a case where the matching circuit is removed;
  • 15 Fig. 10 is a Smith chart showing impedance characteristics in a DCS frequency band of a multi-frequency antenna according to an embodiment of the present invention in a case where the matching circuit is removed;
  • 16 FIG. 12 is a diagram illustrating VSWR characteristics in a DCS frequency band of a multi-frequency antenna according to an embodiment of the present invention in a case where the matching circuit is removed; FIG.
  • 17 Fig. 10 is a Smith chart showing impedance characteristics in a GSM frequency band of a multi-frequency antenna according to an embodiment of the present invention in a case where the matching circuit and the passive element structure are removed;
  • 18 Fig. 12 is a diagram showing VSWR characteristics in a GSM frequency band of a multi-frequency antenna according to an embodiment of the present invention in a case where the matching circuit and the passive element structure are removed;
  • 19 Fig. 12 is a Smith chart showing impedance characteristics in a DCS frequency band of a multi-frequency antenna according to an embodiment of the present invention in a case where the matching circuit and the passive element structure are removed;
  • 20 FIG. 12 is a diagram showing VSWR characteristics in a DCS frequency band of a multi-frequency antenna according to an embodiment. FIG represents form of the present invention, in a case where the matching circuit and the structure of the passive element are removed;
  • 21 Fig. 12 is a diagram showing the state of a multi-frequency antenna according to an embodiment of the present invention for measuring a radiation pattern in the vertical plane;
  • 22 Fig. 12 is a diagram illustrating a radiation pattern in a vertical plane at 1710 MHz for a multi-frequency antenna according to an embodiment of the present invention;
  • 23 Fig. 12 is a diagram illustrating a radiation pattern in a vertical plane at 1795 MHz for a multi-frequency antenna according to an embodiment of the present invention;
  • 24 Fig. 12 is a diagram illustrating a radiation pattern in a vertical plane at 1880 MHz for a multi-frequency antenna according to an embodiment of the present invention;
  • 25 FIG. 12 is a diagram illustrating the state of a multi-frequency antenna according to an embodiment of the present invention for measuring a radiation pattern in a vertical plane; FIG.
  • 26 Fig. 12 is a diagram illustrating a radiation pattern in a vertical plane at 1710 MHz for a multi-frequency antenna according to an embodiment of the present invention;
  • 27 Fig. 12 is a diagram illustrating a radiation pattern in a vertical plane at 1795 MHz for a multi-frequency antenna according to an embodiment of the present invention;
  • 28 Fig. 12 is a diagram illustrating a radiation pattern in a vertical plane at 1880 MHz for a multi-frequency antenna according to an embodiment of the present invention;
  • 29 FIG. 12 is a diagram illustrating the state of a multi-frequency antenna according to an embodiment of the present invention for measuring a radiation pattern in a horizontal plane; FIG.
  • 30 Fig. 12 is a diagram illustrating a radiation pattern in a horizontal plane at 1710 MHz for a multi-frequency antenna according to an embodiment of the present invention;
  • 31 Fig. 12 is a diagram illustrating a radiation pattern in a horizontal plane at 1795 MHz for a multi-frequency antenna according to an embodiment of the present invention;
  • 32 Fig. 12 is a diagram illustrating a radiation pattern in a horizontal plane at 1880 MHz for a multi-frequency antenna according to an embodiment of the present invention;
  • 33 FIG. 12 is a diagram illustrating the state of a multi-frequency antenna according to an embodiment of the present invention for measuring a radiation pattern in a vertical plane; FIG.
  • 34 FIG. 12 is a diagram illustrating a radiation pattern in a vertical plane at 870 MHz for a multi-frequency antenna according to an embodiment of the present invention; FIG.
  • 35 Fig. 12 is a diagram illustrating a radiation pattern in a vertical plane at 915 MHz for a multi-frequency antenna according to an embodiment of the present invention;
  • 36 Fig. 12 is a diagram illustrating a radiation pattern in a vertical plane at 960 MHz for a multi-frequency antenna according to an embodiment of the present invention;
  • 37 FIG. 12 is a diagram illustrating the state of a multi-frequency antenna according to an embodiment of the present invention for measuring a radiation pattern in a vertical plane; FIG.
  • 38 FIG. 12 is a diagram illustrating a radiation pattern in a vertical plane at 870 MHz for a multi-frequency antenna according to an embodiment of the present invention; FIG.
  • 39 Fig. 12 is a diagram illustrating a radiation pattern in a vertical plane at 915 MHz for a multi-frequency antenna according to an embodiment of the present invention;
  • 40 Fig. 12 is a diagram illustrating a radiation pattern in a vertical plane at 960 MHz for a multi-frequency antenna according to an embodiment of the present invention;
  • 41 FIG. 12 is a diagram illustrating the state of a multi-frequency antenna according to an embodiment of the present invention for measuring a radiation pattern in a horizontal plane; FIG.
  • 42 FIG. 10 is a diagram showing a radiation pattern in a horizontal plane at 870. FIG MHz for a multi-frequency antenna according to an embodiment of the present invention;
  • 43 FIG. 12 is a diagram illustrating a radiation pattern in a horizontal plane at 915 MHz for a multi-frequency antenna according to an embodiment of the present invention; FIG.
  • 44 FIG. 12 is a diagram illustrating a radiation pattern in a horizontal plane at 960 MHz for a multi-frequency antenna according to an embodiment of the present invention; FIG.
  • 45 Fig. 12 is a diagram showing a structure in which the shape of the structure of the passive element in the antenna circuit board of a multi-frequency antenna according to an embodiment of the present invention has been changed;
  • 46 Fig. 10 is a Smith chart showing impedance characteristics in a GSM frequency band for a multi-frequency antenna according to an embodiment of the present invention in a case where the shape of the passive element structure in the antenna circuit board has been changed;
  • 47 Fig. 12 is a diagram illustrating VSWR characteristics in a GSM frequency band for a multi-frequency antenna according to an embodiment of the present invention in a case where the shape of the structure of the passive element in the antenna circuit board has been changed;
  • 48 Fig. 12 is a Smith chart showing impedance characteristics in a DCS frequency band for a multi-frequency antenna according to an embodiment of the present invention in a case where the shape of the structure of the passive element in the antenna circuit board has been changed;
  • 49 Fig. 12 is a diagram illustrating VSWR characteristics in a DCS frequency band for a multi-frequency antenna according to an embodiment of the present invention in a case where the shape of the passive element structure in the antenna circuit board has been changed;
  • 50 Fig. 12 is a diagram showing another construction in which the shape of the structure of the passive element in the antenna circuit board of a multi-frequency antenna has been changed according to an embodiment of the present form;
  • 51 Fig. 10 is a Smith chart showing impedance characteristics in a GSM frequency band for a multi-frequency antenna according to an embodiment of the present invention in a case where the shape of the passive element structure in the antenna circuit board has been changed;
  • 52 FIG. 12 is a diagram illustrating VSWR characteristics in a GSM frequency band for a multi-frequency antenna according to an embodiment of the present invention in a case where the shape of the passive element structure in the antenna circuit board has been changed; FIG.
  • 53 Fig. 12 is a Smith chart showing impedance characteristics in a DCS frequency band for a multi-frequency antenna according to an embodiment of the present invention in a case where the shape of the structure of the passive element in the antenna circuit board has been changed; and
  • 54 FIG. 12 is a diagram illustrating VSWR characteristics in a DCS frequency band for a multi-frequency antenna according to an embodiment of the present invention in a case where the shape of the passive element structure in the antenna circuit board has been changed. FIG.
  • BEST MODE FOR EXECUTING THE INVENTION
  • 1 and 2 illustrate the construction of an embodiment of a multi-frequency antenna according to the present invention. 1 illustrates the entire construction of a multi-frequency antenna according to the present invention, and 2 FIG. 12 is an enlarged view of a portion thereof. FIG.
  • The multi-frequency antenna 1 According to the present invention, as shown in these diagrams, by an antenna element 10 , which forms a whip antenna, and an antenna housing section 2 on which the antenna element 10 Removable installed, built. The antenna housing section 2 is through a metallic antenna base section 3 (please refer 3 and 4 ) and a cover section 2 B made of resin that fits into the antenna base section 3 engages, built. The antenna element 10 has a bendable, elastic element section 11 , a spiral-shaped element section 5 formed in a spiral shape on the upper end of the bendable elastic member portion 11 is provided, and an antenna tip 4 at the top of the spiral element section 5 is provided on. Furthermore is one end of a choke coil 12 with the lower end of the elastic element section 11 connected and the other end of the inductor 12 is with a phone element 13 connected, which corresponds to an upper element for the use of a D-network (GSM). A mounting screw section 14 is at the bottom of the phone element 13 intended. An antenna shaft section 6 is by molding over the lower portion of the spiral element section 5 , and about the eleastic element section 11 , the choke coil 12 , the telephone element 13 and the upper portion of the Befestigungsschraubabschnitts 14 , educated. In this case, the telephone element forms 13 a lower element of the antenna element 10 ,
  • Here gives "D-Netz" a mobile band based on the above-mentioned GSM system and "E-net" mentioned below a second mobile band based on the aforementioned DCS system at.
  • Here is also a device for preventing wind noise in a coil form on the surface of the spiral element section 5 intended. Furthermore, the elastic element section is used 11 to pick up a load by bending when there is a lateral load on the antenna element 10 is applied, whereby a shattering is prevented. This elastic element section 11 may be formed by an elastic wire rope or a coil spring.
  • Here poses 3 a plan view of the structure of a multi-frequency antenna 1 wherein the antenna element 10 and the cover section 2 B have been removed, and 4 FIG. 10 is a plan view thereof. The multi-frequency antenna 1 will now be described with reference to these diagrams.
  • The cover section 2 B formed by resin molding is at the metallic antenna base portion 3 represented in 3 and 4 , and a circular, tubular installation section 3a for installation on the roof, or the like, of a vehicle so formed as to extend from the antenna base section 3 protrudes. A screw thread is in the outer periphery of the installation section 3a cut in, and, by engaging a nut with this installation section 3a , the antenna base section can 3 and securing the nut in a position on either side of the vehicle body. The antenna base section 3 and the cover section 2 B are interconnected by a pair of screws through a pair of threaded trapezoidal threaded holes 3c located in the antenna base section 3 are formed from the surface thereof, and cut into the cover portion 2 B , pass through. A through hole is in the axial direction of the installation portion 3a formed and a telephone output cable 31 for a D-network and an E-network, an AM / FM output cable 32 and a power cable 33 are from the interior of the antenna housing section 2 led out through this through hole. In this case, an incised groove (not shown) is in the through hole in the installation section 3a formed, and the phone output cable 31 and the AM / FM output cable 32 can, using this cutout groove, in an approximately parallel manner to the rear surface of the antenna base portion 3 be guided. A first connection 31a is at the front end of the telephone output cable 31 provided and a second connection 32a is at the front end of the AM / FM output cable 32 provided, these connections 31a . 32a with corresponding devices, which are each installed inside the vehicle, are connected.
  • A hotshoe on which the antenna element 10 Removable, is attached to an insert on the top of the section 2 B that the antenna housing section 2 forms, formed. By screwing the Befestigungsschraubabschnitts 14 of the antenna element 10 on this hotshoe 2a can the antenna element 10 mechanically and electrically to the antenna housing section 2 be attached. Two circuit boards, namely an antenna circuit board 7 and an amplifier board 9 , are in an upright manner within the antenna housing section 2 added. The antenna circuit board 7 and the amplifier board 9 are in an upright manner by soldering to a grounding bracket 3b attached to the upper surface of the antenna base section 3 is attached. A connecting part 8b which is bent in a 1-shape is by soldering, or the like, at the upper end of the antenna circuit board 7 attached, and a connecting screw 8a is in the connection part 8b from the inside of the hotshoes 2a screwed. This will make the antenna element 10 at the hotshoe 2a is fixed, electrically to the antenna circuit board 7 , via the connecting screw 8a and the connecting part 8b , connected.
  • The characteristic feature of the structure of the multi-frequency antenna 1 According to the present invention, the provision of an antenna circuit board is provided 7 inside the antenna housing section 2 is included. An antenna structure 7a that works as an antenna for an e-net is at the antenna board 7 educated. This antenna structure 7a works as an element for a D network in conjunction with the telephone element 13 , Here is the structure of the antenna board 7 with reference to 7 and 8th described. 7 provides the structure of the front surface of an antenna circuit board 7 and 8th represents the structure of the rear surface of an antenna circuit board 7 dar. The antenna circuit board 7 has, as shown in these diagrams, a hexagonal shape, which is modified to the shape of the interior of the antenna housing portion 2 adapt. A broad antenna structure 7a is from the upper part to the central part of the front surface of the antenna circuit board 7 formed and a broad antenna structure 7a of approximately the same shape is on the back surface of the antenna circuit board 7 educated. The antenna structures 7a Although not shown in the drawings, the front surface and the back surface are connected to each other by a plurality of through holes. Furthermore, a structure 7b a parasitic element on the antenna circuit board 7 near the antenna structures 7a educated. The lower edge of this structure 7b of the parasitic element is with a grounding structure 7d connected. The antenna structure 7a is by making a structure 7b a passive element, also able to work in a DCS (E-network) frequency band. The grounding structure 7d is on the lower part of the front surface and the back surface of the antenna circuit board 7 educated. Between the antenna structure 7a , the structure 7b of the parasitic element and the grounding structure 7d is a circuit structure 7c formed a low-pass filter (LPF) 21 and a high pass filter (HPF) 20 employs a matching circuit which forms a frequency divider circuit for dividing the signals into the respective frequency bands. On the antenna circuit board 7 is a through hole 21a in the output section of the LPF 21 provided and a through hole 20a is in the exit section of the HPF 20 intended.
  • For an example of the dimensions of the antenna board 7 is the width L1 of the antenna circuit board 7 about 49.5 mm, the height L2 is about 21.9 mm. Furthermore, the length of the structure is 7b of the parasitic element about 40 mm and the interval between the antenna structure 7a and the structure 7b of the parasitic element is about 2-3 mm. These dimensions refer to a case where the antenna structure 7a and the structure 7b of the parasitic element for communications over the E-network and the D-network, and the dimensions given above will differ when the antenna is used for different frequency bands.
  • The structure 7b The parasitic element may also be on the back surface of the antenna circuit board 7 instead of the front surface thereof, and further, the structure of the parasitic element does not necessarily have to be with the grounding structure 7d get connected.
  • 5 represents an equivalent circuit of a multi-frequency antenna 1 that is with an antenna circuit board 7 is provided, which has the structure in 7 and 8th is shown. A metallic connection part 8b is how in 1 to 3 is shown on the upper end of the antenna circuit board 7 provided, and this connecting part 8b is at the top of the antenna structure 7a connected. By screwing the Befestigungsschraubabschnitts 14 of the antenna element 10 in the hotshoe 2a of the antenna housing section 2 the antenna element becomes electrically connected to the connection part 8b connected, in turn, via the connecting screw 8a with the hotshoe 2a connected is. This will be the upper element 10a that consists of a spiral element section 7 and an elastic element portion 11 exists, the choke coil 12 , the telephone element 13 and the antenna structure 7a in series as interconnected as in 5 is shown. The structure 7b of the parasitic element is in the vicinity of the antenna structure 7a intended.
  • The multi-frequency antenna 1 According to the present invention, it is capable of receiving signals by resonating with an FM transmitter via the entire antenna as well as being able to receive AM broadcasts. Furthermore shows, in the mobile radio bands of the D-network and the E-network, the choke coil 12 a high impedance and is isolated, eliminating the phone element 13 , the antenna structure 7a and the structure 7b of the passive element resonate with the D-network and are capable of transmitting and receiving data communications in the GSM network, while also resonating with the E-network and being able to transmit data in the DCS frequency band to send and receive. However, it will also be understood clearly why the antenna, which is a telephone element 13 , the antenna structure 7a and the structure 7b of the parasitic element is able to operate in bands of both the E-network and the D-network. Furthermore, the antenna circuit board continues 7 a frequency divider circuit consisting of an HPF 20 and an LPF 21 consists of dividing signals in the AM / FM frequency band and signals in the frequency bands of the D-network and the E-network, while the amplifier circuit board 9 an amplifying circuit for amplifying the split AM / FM frequency bands.
  • In other words, the output end of the multi-frequency antenna 1 with a HPF 20 and an LPF 21 connected, the frequency components of the D-network and the E-network are through the HPF 20 divided and the split signal becomes from the GSM / DCS outlets. Furthermore, the AM / FM frequency components become the LPF 21 split and the split signal is through the AM / FM amplifier 22 in the amplifier board 9 amplified and output from the AM / FM output terminals. Furthermore, to the characteristics of the multi-frequency antenna 1 to improve a matching circuit in the HPF 20 used.
  • Provides this 6 an example of the circuit of the HPF 20 and the LPF 21 in the antenna circuit board 7 are used, dar.
  • The connection ANT IN of the antenna circuit board 7 corresponds to the connecting part 8b connected to the upper end of the antenna structure 7a connected is. The HPF 20 is at the bottom of the antenna structure 7a and is a T-type high-pass filter having two series-connected capacitors C1, C2 and an inductor L1 arranged between them and ground. Further, a capacitor C3 and a resistor R for regulating the output impedance are connected between the output side of the capacitor C2 and the ground. In the HPF 20 For example, the frequency components of the D network and the E network are divided and the separated signal is output to the GSM / DCS output terminal. The capacitor C3 and the high-pass filter T-type also work as a matching circuit to the impedance between the multi-frequency antenna 1 and the radio device to regulate.
  • On the other hand, the LPF 21 also with the lower end of the antenna structure 7a and has a T-type low pass filter consisting of serially connected inductors L2, L3 and a capacitor C4 connected between them and ground. The AM / FM frequency components produced by the LPF 21 are separated from the antenna board 7 to the amplifier board 9 fed by the AM / FM amplifier 22 in the amplifier board 9 are amplified and output from the AM / FM output port.
  • In the antenna circuit board 7 is by arranging the structure 7b of the parasitic element near the antenna structure 7a , the antenna passing through the phone element 13 and the antenna structure 7a , built on the antenna circuit board 7 , is capable of operating in the DCS frequency band as well. To the effect of the structure 7b describe this parasitic element, the antenna characteristics, in a case where the shape of the structure 7 of the parasitic element with respect to the shape that is in 7 is shown, is changed, described below.
  • First, it is assumed that the shape of the structure of the passive element on the antenna circuit board 7 the multi-frequency antenna 1 is formed according to the present invention is changed as shown in 45 is shown. The section of the structure 7b of the passive element, indicated by the broken lines, is in 45 to thereby narrow the width thereof, so as to have a structure 77b a passive element with a shape to form a greater interval of the antenna structure 7a has. The 46 to 49 provide a comparison of the antenna characteristics between a multi-frequency antenna 1 that the antenna circuit board 7 , in the 45 is shown, and a multi-frequency antenna 1 that the antenna circuit board 7 owns that in 7 and 8th is shown, dar. 46 represents impedance characteristics represented by a Smith chart in the GSM frequency band, and 47 represents VSWR (Voltage Standing Wave Ratio) characteristics in the GSM frequency band. 48 represents impedance characteristics represented by a Smith chart in the DCS frequency band, and 49 represents VSWR characteristics in the DCS frequency band 46 to 49 For example, the antenna characteristics marked as "present invention" are characteristics in a case where the antenna board 7 is constructed as in 7 and 8th and the antenna characteristics marked as "A" - "D" stand for a case where the antenna board 7 is constructed as in 45 is shown.
  • From these characteristics, it can be seen that, in the GSM frequency band, if the shape of the antenna structure is similar to that in FIG 45 is changed, the antenna characteristics deteriorate up to the central frequency thereof (mark 2: 915 MHz), but eventually improve above the central frequency. However, in the DCS frequency band, when the shape of the antenna structure is changed to that in FIG 45 is shown, the antenna characteristics over the entire frequency band.
  • Next, assume that the structure of the passive element is on the antenna circuit board 7 in the multi-frequency antenna 1 is formed according to the present invention is changed as shown in 50 is shown. The front end portion of the structure 7 of the passive element, indicated by the broken lines, is in 50 removed, thereby creating a structure 7b a passive element that has a shorter overall length. The 51 to 54 provide a comparison of antenna characteristics between a multi-frequency antenna 1 that the An antennas board 7 owns that in 50 is shown, and a multi-frequency antenna 1 that the antenna circuit board 7 , in the 7 and 8th is shown, has, dar. 51 represents impedance characteristics indicated by a Smith chart in the GSM frequency band, and 52 represents VSWR (Voltage Standing Wave Ratio) characteristics in the GSM frequency band. 53 represents impedance characteristics represented by a Smith chart in the DCS frequency band, and 54 represents VSWR characteristics in the DCS frequency band. In 46 to 49 For example, the antenna characteristics marked as "present invention" are characteristics in a case where the antenna board 7 is constructed as in 7 and 8th and the antenna characteristics marked as "E" - "H" are characteristics of a case where the antenna board 7 is constructed as in 50 is shown.
  • Considering these antenna characteristics, it can be seen that in the GSM frequency band, when the shape of the antenna structure is changed to that in FIG 50 which deteriorate antenna characteristics up to the central frequency thereof (mark 2: 915 MHz), but eventually improve above the central frequency thereof. However, in the DCS frequency band, when the shape of the antenna structure deteriorates to that in the DCS frequency band 50 is changed, then the antenna characteristics over the entire frequency band.
  • Therefore, by changing the shape of the passive element structure, it is possible to adjust the antenna characteristics of the lower frequency band and the higher frequency band of the GSM band in opposite directions, and further it is possible to adjust antenna characteristics for the entire DCS frequency band , With the shape of the structure 7b of the passive element, represented in 7 and 8th , optimum antenna characteristics are obtained in both the DCS frequency band and the GSM frequency band.
  • Next, the antenna characteristics of the multi-frequency antenna will be described 1 described in a case where the structure of the passive element on the antenna circuit board 7 formed, which possesses form, which in 7 and 8th is shown.
  • 9 to. 12 represent the antenna characteristics of the multi-frequency antenna 1 in the case of an antenna circuit board 7 as they are in 7 and 8th is shown, dar. 9 represents impedance characteristics shown on a Smith chart in the GSM frequency band, and 10 represents VSWR characteristics in the GSM frequency band 11 Impedance characteristics shown on a Smith chart in the DCS frequency band, and 12 Figure 4 illustrates VSWR characteristics in the DCS frequency band. Considering these antenna characteristics, it can be seen that in the 870 MHz - 960 MHz frequency band, a best VSWR of about 1.1 and a worst VSWR of about 1 , 47, and as a result good impedance characteristics are achieved. Further, in a DCS frequency band of 1.71 GHz-1.88 GHz, a best VSWR of about 1.2 and a worst VSWR of about 1.78 were obtained, and accordingly, good impedance characteristics are achieved.
  • The antenna characteristics used in 9 to 12 are antenna characteristics in the case of an antenna comprising an HPF 20 and an LPF 21 which have a circuit structure in 6 in which case the values for the various elements of the HPF 20 and LPF 21 as follows. In the HPF 20 For example, the capacitors C1, C2 are about 3 pF, the capacitor C3 is about 0.5 pF, and the inductance L1 is about 15 nH, whereas in the LPF 21 the inductance L2 is a hollow coil of about 30 nH, the inductance L3 is 0.12 μH, and the capacitor C4 is about 13 pF.
  • The HPF 20 As described above, sets up a matching circuit and to describe the effect of this matching circuit 13 to 16 Antenna characteristics in a case where the LPF 21 and the HPF 20 represented in 6 (including the capacitor C3) are removed. 13 represents impedance characteristics shown on a Smith chart in the GSM frequency band, and 14 represents VSWR characteristics in the GSM frequency band 15 Impedance characteristics shown on a Smith chart in the DCS frequency band, and 16 Considering these antenna characteristics, it can be seen that in the 870 MHz-960 MHz frequency band, the impedance characteristics are degraded in such a way that a best VSWR value of about 2.19 and a worst VSWR of about 3.24. Furthermore, in the DCS frequency band of 1.71 GHz-1.88 GHz, it can be seen that the impedance characteristics are degraded in such a manner that a best VSWR value of about 2.6 and a worst VSWR value Value of about 3.38.
  • Therefore can be seen that, by removing the matching circuit In this way, antenna characteristics in both the GSM and as well as the DCS frequency band be worsened.
  • Next pose to the effect of the structure 7b to describe the passive element for the purpose of a reference 17 to 20 Antenna characteristics in a case where the structure 7b of the passive element and the LPF 21 and the HPF 20 (including the capacitor C3) shown in FIG 6 , are removed. 17 represents impedance characteristics shown on a Smith chart in the GSM frequency band, and 18 represents VSWR characteristics in the GSM frequency band 19 Impedance characteristics shown on a Smith chart in the DCS frequency band, and 20 illustrates VSWR characteristics in the DCS frequency band. Considering these antenna characteristics, it can be seen that in the GSM frequency band at 870 MHz-960 MHz, the impedance characteristics are greatly degraded in such a way that a best VSWR value of about 4.8 and a worst VSWR of about 5.62. Furthermore, in the DCS frequency band of 1.71 GHz-1.88 GHz, it can be seen that the impedance characteristics are degraded in such a manner that a best VSWR value of about 1.6 and a worst case VSWR value of about 2.67 can be obtained.
  • Therefore, it can be seen that, by removing the structure 7b of the passive element and the matching circuit in this way, antenna characteristics are degraded especially in the GSM frequency band.
  • Next, the radiation pattern in the vertical plane and the radiation pattern in the horizontal plane of the multi-frequency antenna 1 according to the present invention in the DCS frequency band and the GSM frequency band in 22 to 44 shown.
  • The radiation pattern in the vertical plane, shown in 22 to 24 , the radiation pattern in the vertical plane is in the DCS frequency band as seen from the side for a multi-frequency antenna 1 is seen on a ground plane 50 is installed with a diameter of about 1 m, as in 21 is shown, and the elevation angle and the inclination angle are as in 21 is shown. 22 represents a radiation pattern in the vertical plane at 1710 MHz, which is the lowest frequency in the DCS frequency band, and shows concentric circles at intervals of -3 dB. As can be seen from these directivity characteristics, a large gain is obtained in the direction ± 60 ° ± 90 ° and in the direction of the zenith. The antenna gain in this case is a high gain of about +2.55 dB compared to a ½-wavelength dipole antenna.
  • 23 represents a radiation pattern in the vertical plane at 1795 MHz, which is the central frequency of the DCS band, and shows concentric circles at intervals of -3 dB. As can be seen from these directivity characteristics, the gain drops near -30 ° and near 45 °, but good directional characteristics are obtained in the direction of 100 ° - 100 °. In this case, the antenna gain is a high gain of about +1.82 dB compared to a ½-wavelength dipole antenna.
  • 24 represents a radiation pattern in the vertical plane at 1880 MHz, which is the highest frequency of the DCS band, and shows concentric circles at intervals of -3 dB. Considering these directional characteristics, the gain drops near -30 ° and near 45 °, but good directional characteristics are obtained in the direction of 100 ° - 100 °. In this case, the antenna gain is a high gain of about +1.98 dB compared to a ½-wavelength dipole antenna.
  • The radiation pattern in the vertical plane, shown in 26 to 28 , is a radiation pattern in the vertical plane in the DCS frequency band, as seen from the front for a multi-frequency antenna 1 is seen on a ground plane 50 is installed with a diameter of about 1 m, as in 25 is shown, and the elevation angle and the inclination angle are as in 25 is shown. 26 represents a radiation pattern in the vertical plane at 1710 MHz, which is the lowest frequency in the DCS band, and shows concentric circles at intervals of -3 dB. Considering these directional characteristics, the gain drops near the direction of -90 ° and in the direction of the zenith, but good directional characteristics are obtained in the direction of about 100 ° -75 °. The antenna gain in this case is a high gain of about -4.33 dB, compared to a ½-wavelength dipole antenna.
  • 27 represents a radiation pattern in the vertical plane at 1795 MHz, which is the central frequency of the DCS band, and shows concentric circles at intervals of -3 dB. Considering these directional characteristics, the gain drops near the direction of -90 ° and in the direction of the zenith, but becomes good Directional characteristics obtained in the direction of about 90 ° --80 °. In this case, the antenna gain is a high gain of about -1.9 dB, compared to a ½-wavelength dipole antenna.
  • 28 represents a radiation pattern in the vertical plane at 1880 MHz, which is the highest frequency of the DCS band, and shows concentric circles at intervals of -3 dB. The gain drops, considering these directional characteristics, near the direction of -90 ° and in the direction of the zenith, but good directional characteristics are obtained in the direction of approximately 90 ° -80 °. In this case, the antenna gain is a high gain of about -1.59 dB compared to a ½-wavelength dipole antenna.
  • The radiation pattern in the horizontal plane, the in 30 to 32 is a radiation pattern in the horizontal plane in the DCS frequency band for a multi-frequency antenna 1 on a ground plane 50 is installed with a diameter of about 1 m, as in 29 and the angle thereof is assumed to be an angle of 0 ° in the forward direction as shown in FIG 29 is shown. 30 represents a radiation pattern in the horizontal plane at 1710 MHz, which is the lowest frequency in the DCS band, and shows concentric circles at intervals of -3 dB. Considering these directional characteristics, the gain drops near -100 ° and near 90 °, but good directional characteristics that are practically omnidirectional are obtained. The antenna gain in this case is about 0 dB compared to a ½-wavelength whip antenna.
  • 31 represents a radiation pattern in the horizontal plane at 1795 MHz, which is the central frequency in the DCS band, and shows concentric circles at intervals of -3 dB. Considering these directional characteristics, the gain drops near -100 ° and near 90 ° -120 °, but good directional characteristics that are practically omnidirectional are obtained. In this case, the antenna gain is -0.83 dB compared to a ½-wavelength whip antenna.
  • 32 represents a radiation pattern in the horizontal plane at 1880 MHz, which is the highest frequency in the DCS band, and shows concentric circles at intervals of -3 dB. Considering these directional characteristics, the gain drops in the vicinity of -90 ° to -120 ° and in the vicinity of 80 ° to 120 °, but good directional characteristics, which are practically omnidirectional, are obtained. In this case, the antenna gain is about -0.51 dB compared to a ¼-wavelength whip antenna.
  • The radiation pattern in the vertical plane that is in 34 to 36 is a radiation pattern in the vertical plane in the GSM frequency band as viewed from the side for a multi-frequency antenna 1 is seen on a ground plane 50 is installed with a diameter of about 1 m, as in 33 and the angle of elevation and the angle of inclination thereof are as shown in FIG 33 is shown. 34 represents a radiation pattern in the vertical plane at 870 MHz, which is the lowest frequency in the GSM band, and shows concentric circles at intervals of -3 dB. Considering these directional characteristics, the gain drops near 10 ° and near -90 °, but good gain is obtained in the direction from 90 ° to -80 °. The antenna gain in this case is about -0.15 dB compared to a ½-wavelength dipole antenna.
  • 35 represents a radiation pattern in the vertical plane at 915 MHz, which is the center frequency of the GSM band, and shows concentric circles at intervals of -3 dB. Considering these directional characteristics, the gain decreases in the direction of -80 ° and below and in the vicinity of 90 °, but good directional characteristics are obtained in the direction from 80 ° to -75 °. In this case, the antenna gain is +0.8 dB compared to a ½-wavelength dipole antenna.
  • 36 represents a radiation pattern in the vertical plane at 960 MHz, which is the highest frequency of the GSM band, and shows concentric circles at intervals of -3 dB. The gain falls in the direction of -80 ° and below and in the vicinity of 90 °, considering these directional characteristics, but good directional characteristics are obtained in the direction of 85 ° to -80 °. In this case, the antenna gain is about -0.47 dB compared to a ½-wavelength dipole antenna.
  • The radiation pattern in the vertical plane that is in 38 to 40 is a radiation pattern in the vertical plane in the GSM frequency band as viewed from the front for a multi-frequency antenna 1 is seen on a ground plane 50 is installed with a diameter of about 1 m, as in 37 is shown, and the elevation angle and the inclination angle thereof are as shown in FIG 37 is shown. 38 represents a radiation pattern in the vertical plane at 870 MHz, which is the lowest frequency in the GSM band, and it shows concentric circles at intervals of -3 dB. Considering these directional characteristics, the gain drops near -20 °, the vicinity of the zenith and the vicinity of 20 °, but good directional characteristics are obtained in the direction of approximately 90 ° to -90 °. The antenna gain in this case is about -0.1 dB compared to a ½-wavelength dipole antenna.
  • 39 represents a radiation pattern in the vertical plane at 915 MHz, which is the central frequency in the GSM band, and shows concentric circles at intervals of -3 dB. Considering these directional characteristics, the gain drops near -30 °, the vicinity of the zenith and the vicinity of 30 °, but good directional characteristics are obtained in the direction of approximately 90 ° to -90 °. In this case, the antenna gain is about +1.24 dB, compared to a ½-wavelength dipole antenna.
  • 40 represents a radiation pattern in the vertical plane at 960 MHz, which is the highest frequency of the GSM band, and shows concentric circles at intervals of -3 dB. The gain drops, considering these directional characteristics, near -30 °, the vicinity of the zenith and the vicinity of 30 °, but good directional characteristics are obtained in the direction of approximately 90 ° to -90 °. The antenna gain in this case is a high gain of about +1.21 dB compared to a ½-wavelength dipole antenna.
  • The radiation pattern in the horizontal plane, the in 42 to 44 is a radiation pattern in the horizontal plane in the GSM frequency band for a multi-frequency antenna 1 on a ground plane 50 is installed with a diameter of about 1 m, as in 41 and the angle thereof is assumed to be an angle of 0 ° in the forward direction as shown in FIG 41 is shown. 42 represents a radiation pattern in the horizontal plane at 870 MHz, which is the lowest frequency in the GSM band, and shows concentric circles at intervals of -3 dB. Considering these directional characteristics, the gain drops slightly in the vicinity of 0 ° and in the vicinity of -180 °, but good directional characteristics, which are practically omnidirectional, are obtained. The antenna gain in this case is about -1.38 dB compared to a ¼-wavelength whip antenna.
  • 43 represents a radiation pattern in the horizontal plane at 915 MHz, which is the central frequency in the GSM band, and shows concentric circles at intervals of -3 dB. Considering these directional characteristics, good directional characteristics are obtained, which are practically omnidirectional. In this case, the antenna gain is about -1.13 dB compared to a ¼-wavelength whip antenna.
  • 44 represents a radiation pattern in the horizontal plane at 960 MHz, which is the highest frequency in the GSM band, and shows concentric circles at intervals of -3 dB. Considering these directional characteristics, the gain drops near 0 °, but good directional characteristics, which are practically omnidirectional, are obtained. In this case, the antenna gain is about -1.43 dB compared to a ¼-wavelength whip antenna.
  • In this radiation pattern in the vertical plane, it can be seen that a large gain can be obtained practically at a low elevation angle in the frequency bands of the D network and the E network, and accordingly, a multi-frequency antenna 1 which is suitable for mobile communications. Furthermore, by considering these radiation patterns in the horizontal plane, it can be seen that even if an antenna structure 7a and a structure 7b a passive element on an antenna circuit board 7 formed inside the antenna housing section 2 is installed, practically omnidirectional characteristics are obtained on the horizontal plane in both the GSM and the DCS frequency band.
  • The structure 7b of the passive element on the antenna circuit board 7 is formed in the multi-frequency antenna according to the present invention described above is not limited to the shape shown in FIG 7 is limited, but may, in contrast, according to the shape of the antenna circuit board 7 and the frequency bands that are used to be changed. In this case, the shape of the structure 7b of the passive element is made into a form in which the width and the length are set in such a manner as to obtain good VSWR characteristics in the frequency bands used.
  • Furthermore, the values given for the HPF 20 and the LPF 21 in the antenna circuit board 7 are not limited to the values described above, but may rather be changed according to the frequency bands used and the impedance, etc., of the antenna connection portion in the mobile radio apparatus. In this case, they are set to values that will give a good VSWR value in the frequency bands that are used.
  • INDUSTRIAL APPLICABILITY
  • The Antenna device, which is a lower element, and an antenna structure and a structure of a passive element on an antenna circuit board are formed, as stated above, are, are, accordingly of the present invention, in a first frequency band and a second frequency band that is about twice the frequency the first frequency band is to work without a choke too As a result, the multi-frequency antenna can be made compact be designed.
  • Farther can FM / AM broadcasts through the entire antenna, including one upper antenna over a choke coil is connected to the lower element become. The multi-frequency signal generated by the multi-frequency antenna is received by frequency divider devices into a mobile radio signal and a FM / AM signal divided. In this case, a matching circuit also used in the section for dividing the mobile bands and, as the frequency dividing means within the antenna housing section may contain a more compact construction of the multi-frequency antenna be achieved.

Claims (5)

  1. Multi-frequency antenna ( 1 ) comprising: an antenna circuit board ( 7 ), on which an antenna structure ( 7a ) and a structure ( 7b ) of a passive element in the vicinity of the antenna structure ( 7a ) are formed, an antenna housing section ( 2 ) for receiving the antenna circuit board; and an antenna element ( 10 ), in which a choke coil ( 12 ) between an upper element ( 11 ) and a lower element ( 13 ), wherein the lower end of the lower element ( 13 ) is connected to the upper end of the antenna structure formed on the antenna circuit board, when the antenna element ( 10 ) on the antenna housing section ( 2 ) is installed; characterized in that the antenna structure ( 7a ) and the structure ( 7b ) of the passive element in a plane on the antenna circuit board ( 7 ) lie; wherein an antenna device comprising the lower element ( 13 ), the antenna structure ( 7a ) and the structure ( 7b ) of the passive element is arranged to operate in a first frequency band and a second frequency band approximately twice the frequency of the first frequency band.
  2. Multi-frequency antenna ( 1 ) according to claim 1, wherein the first frequency band and the second frequency band are mobile bands.
  3. Multi-frequency antenna ( 1 ) according to claim 1, wherein the entirety of the antenna including the upper element and the choke coil ( 12 ) is arranged to operate in a third frequency band lower than the first frequency band.
  4. Multi-frequency antenna ( 1 ) according to claim 1, wherein a frequency separating device for separating the first frequency band and the second frequency band from the third frequency band is integrated into a printed circuit board which is located inside the antenna housing section (FIG. 2 ) is recorded.
  5. Multi-frequency antenna ( 1 ) according to claim 4, wherein the frequency separating means includes a matching circuit for the first frequency band and the second frequency band.
DE60225513T 2001-02-26 2002-01-22 Tone antenna Active DE60225513T2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2001050642 2001-02-26
JP2001050642 2001-02-26
PCT/JP2002/000407 WO2002069444A1 (en) 2001-02-26 2002-01-22 Multifrequency antenna

Publications (2)

Publication Number Publication Date
DE60225513D1 DE60225513D1 (en) 2008-04-24
DE60225513T2 true DE60225513T2 (en) 2008-06-19

Family

ID=18911571

Family Applications (1)

Application Number Title Priority Date Filing Date
DE60225513T Active DE60225513T2 (en) 2001-02-26 2002-01-22 Tone antenna

Country Status (8)

Country Link
US (1) US6714164B2 (en)
EP (1) EP1291967B1 (en)
JP (1) JP3825408B2 (en)
KR (1) KR100592209B1 (en)
CN (1) CN1307743C (en)
AU (1) AU2002225461B2 (en)
DE (1) DE60225513T2 (en)
WO (1) WO2002069444A1 (en)

Families Citing this family (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10207703B4 (en) 2002-02-22 2005-06-09 Kathrein-Werke Kg Antenna for a receiving and / or transmitting device, in particular as a roof antenna for motor vehicles
US6788261B1 (en) * 2003-04-09 2004-09-07 Wilson Electronics, Inc. Antenna with multiple radiators
FI115574B (en) * 2003-04-15 2005-05-31 Filtronic Lk Oy Adjustable multi-band antenna
US20040266344A1 (en) * 2003-06-27 2004-12-30 Imtiaz Zafar Integrated AM/FM mast with single SDARS antenna
EP1708373B1 (en) * 2004-03-04 2008-07-16 Murata Manufacturing Co., Ltd. Antenna device and radio communication device using the same
ITVI20050031A1 (en) * 2005-02-03 2006-08-04 Calearo Antenne Srl compact multiband antenna
JP4582320B2 (en) * 2005-03-14 2010-11-17 ミツミ電機株式会社 Antenna unit
ITVI20050300A1 (en) * 2005-11-11 2007-05-12 Calearo Antenne Spa vehicle multiband antenna for mobile phones
DE202006020780U1 (en) * 2006-03-16 2010-02-18 Kathrein-Werke Kg Rod antenna, in particular for motor vehicles
JP4798368B2 (en) * 2006-09-04 2011-10-19 ミツミ電機株式会社 Compound antenna device
AT431627T (en) * 2006-11-03 2009-05-15 Delphi Tech Inc Assembly assembly for a motor vehicle antenna
US8081126B2 (en) 2006-11-22 2011-12-20 Nippon Antena Kabushiki Kaisha Antenna apparatus
US20080117111A1 (en) * 2006-11-22 2008-05-22 Nippon Antena Kabushiki Kaisha Antenna Apparatus
KR100848038B1 (en) * 2007-02-14 2008-07-23 주식회사 이엠따블유안테나 Multiple band antenna
KR20100014517A (en) * 2007-04-03 2010-02-10 티디케이 코퍼레이션 Dipole antenna with improved performance in the low frequency range
JP5237617B2 (en) * 2007-11-30 2013-07-17 原田工業株式会社 Antenna device
JP4971212B2 (en) * 2008-01-31 2012-07-11 日本アンテナ株式会社 Helical whip antenna
US7817103B2 (en) 2008-02-28 2010-10-19 Motorola, Inc. Dual-band multi-pitch parasitic half-wave (MPPH) antenna
JP2010021856A (en) * 2008-07-11 2010-01-28 Nippon Antenna Co Ltd Antenna device
EP2166614A1 (en) * 2008-09-17 2010-03-24 Laird Technologies AB An antenna device and a portable radio communication device comprising such antenna device
CN101369819B (en) * 2008-09-24 2012-11-14 中兴通讯股份有限公司 Mobile terminal of sharing antenna of mobile phone television and movable communication module
EP2355234A1 (en) * 2008-11-03 2011-08-10 Radiacion Y Microondas, S.A. Compact orthomode transducer
CN101740847B (en) * 2008-11-14 2013-04-17 华为终端有限公司 Antenna and manufacturing method thereof
JP5546805B2 (en) * 2009-06-19 2014-07-09 日本アンテナ株式会社 Whip antenna
DE102009037722A1 (en) * 2009-08-17 2011-02-24 Heinz Prof. Dr.-Ing. Lindenmeier Antenna rod for a rod antenna for several radio services
US9543661B2 (en) * 2009-11-09 2017-01-10 Tyco Electronics Services Gmbh RF module and antenna systems
JP4913900B1 (en) * 2010-12-08 2012-04-11 日本アンテナ株式会社 Antenna device
JP5654917B2 (en) * 2011-03-24 2015-01-14 原田工業株式会社 Antenna device
EP2665126A1 (en) * 2012-05-14 2013-11-20 2J s.r.o. Antenna devices
GB201213558D0 (en) 2012-07-31 2012-09-12 Ltd Reconfigurable antenna
JP5920122B2 (en) 2012-09-03 2016-05-18 株式会社デンソー In-vehicle antenna device
GB2507788A (en) * 2012-11-09 2014-05-14 Univ Birmingham Vehicle roof mounted reconfigurable MIMO antenna
JP6343230B2 (en) * 2013-12-11 2018-06-13 原田工業株式会社 Compound antenna device
DE202014002207U1 (en) * 2014-02-18 2014-04-09 Antennentechnik Abb Bad Blankenburg Gmbh Multi-range antenna for a receiving and / or transmitting device for mobile use
JP6437232B2 (en) * 2014-07-28 2018-12-12 株式会社ヨコオ In-vehicle antenna device
JP6334313B2 (en) * 2014-08-19 2018-05-30 株式会社ヨコオ Composite antenna and manufacturing method thereof
JP2016111573A (en) * 2014-12-08 2016-06-20 株式会社フジクラ Antenna device
US10403968B2 (en) * 2016-03-28 2019-09-03 Taoglas Group Holdings Limited Antenna systems and methods for incorporating into a body panel

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0298202A (en) * 1988-10-05 1990-04-10 Yagi Antenna Co Ltd Antenna for automobile
JPH057106A (en) * 1991-06-27 1993-01-14 Harada Ind Co Ltd Broad band ungrounded microwave antenna
US5300936A (en) * 1992-09-30 1994-04-05 Loral Aerospace Corp. Multiple band antenna
JP2730480B2 (en) 1993-07-30 1998-03-25 日本アンテナ株式会社 3 wave shared roof antenna
US5463405A (en) * 1994-05-20 1995-10-31 Valor Enterprises, Inc. Cellular telephone coupling network
US5600333A (en) * 1995-01-26 1997-02-04 Larsen Electronics, Inc. Active repeater antenna assembly
JP3296189B2 (en) * 1996-06-03 2002-06-24 三菱電機株式会社 Antenna device
JP3065949B2 (en) * 1996-09-13 2000-07-17 日本アンテナ株式会社 Multi-frequency antenna
US5926143A (en) * 1997-04-23 1999-07-20 Qualcomm Incorporated Multi-frequency band rod antenna
JP3464639B2 (en) * 2000-03-17 2003-11-10 日本アンテナ株式会社 Multi-frequency antenna

Also Published As

Publication number Publication date
US6714164B2 (en) 2004-03-30
CN1460311A (en) 2003-12-03
EP1291967A1 (en) 2003-03-12
KR20020091234A (en) 2002-12-05
EP1291967B1 (en) 2008-03-12
JPWO2002069444A1 (en) 2004-07-02
AU2002225461B2 (en) 2005-12-15
US20030137463A1 (en) 2003-07-24
KR100592209B1 (en) 2006-06-23
EP1291967A4 (en) 2005-07-06
CN1307743C (en) 2007-03-28
DE60225513D1 (en) 2008-04-24
WO2002069444A1 (en) 2002-09-06
JP3825408B2 (en) 2006-09-27

Similar Documents

Publication Publication Date Title
KR100607097B1 (en) An antenna system and a radio communication device having the same
EP0070150B1 (en) Antenna arrangement for personal radio transceivers
AU683907B2 (en) An antenna arrangement
JP3828106B2 (en) Built-in antenna of mobile communication terminal
EP1202380B1 (en) Double-action antenna
US7498990B2 (en) Internal antenna having perpendicular arrangement
KR920002895B1 (en) Mobile communications antenna
KR100414765B1 (en) Ceramic chip antenna
ES2289826T3 (en) Dielectric resonator antenna with circular polarization.
US6057803A (en) Antenna apparatus
JP4508190B2 (en) Antenna and wireless communication device
US6922171B2 (en) Planar antenna structure
US6806834B2 (en) Multi band built-in antenna
FI119535B (en) Multiple-band antenna
KR100995265B1 (en) Antenna device and communication apparatus
US6169523B1 (en) Electronically tuned helix radiator choke
US6963308B2 (en) Multiband antenna
US6646606B2 (en) Double-action antenna
US6198440B1 (en) Dual band antenna for radio terminal
DE60306513T2 (en) Antenna arrangement
US6897814B2 (en) Mobile radio
JP4414599B2 (en) Half loop antenna
EP1790034B1 (en) Antenna device and portable radio communication device comprising such an antenna device
DE60211316T2 (en) Antenna arrangement
DE60302955T2 (en) Tunable multi-band planar antenna

Legal Events

Date Code Title Description
8364 No opposition during term of opposition
R082 Change of representative

Ref document number: 1291967

Country of ref document: EP

Representative=s name: GRUENECKER, KINKELDEY, STOCKMAIR & SCHWANHAEUS, DE